How to manage LVM in Centos system

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本文介绍了LVM(Logical Volume Manager)在CentOS系统中的实际应用案例，包括系统的磁盘分区情况、文件系统使用状况等关键信息。通过具体的命令行操作展示如何管理和调整逻辑卷。

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lvm 应用实例

lwk@qwfys ~ $ ssh lwk@centos
Last login: Fri Jun 29 23:43:48 2018
[lwk@centos ~]$ sudo df -h
[sudo] password for lwk: 
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   17G  981M   16G   6% /
devtmpfs                 3.9G     0  3.9G   0% /dev
tmpfs                    3.9G     0  3.9G   0% /dev/shm
tmpfs                    3.9G  8.5M  3.9G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/sda2               1014M  134M  881M  14% /boot
/dev/sda1                200M  9.8M  191M   5% /boot/efi
tmpfs                    783M     0  783M   0% /run/user/1000
[lwk@centos ~]$ sudo fdisk -l
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.

Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: gpt
Disk identifier: 2F2BE7D6-C859-4D04-9363-E2ECBF280DE1


#         Start          End    Size  Type            Name
 1         2048       411647    200M  EFI System      EFI System Partition
 2       411648      2508799      1G  Microsoft basic 
 3      2508800     41940991   18.8G  Linux LVM       

Disk /dev/sdb: 26.8 GB, 26843545600 bytes, 52428800 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/centos-root: 18.0 GB, 18039701504 bytes, 35233792 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

[lwk@centos ~]$